Patent US3968840A successfully refreshed from Google Patents.
US3968840A
Expired / Lapsed
US
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Controlled rate acidization process
Assignee: Texaco Inc
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Filing: 1973-05-25
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Granted: 1976-07-13
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Expires: 1993-05-25
Abstract
Abstract A process is provided whereby a subterranean formation may be treated uniformly with acid at a controlled rate to a considerable distance from an injection point. The process includes an introduction of an acid which is solid but will slowly solubilize in water or brine in a subterranean formation. The introduction of the solid acid may take place via fracture fissures in the formation and also if desired in conjunction with a propping agent.
Inventors
- 👤 Jack F. Tate
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:09
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/60; C09K8/62; C09K8/72; E; E21; E21B; E21B43/00; E21B43/25; E21B43/26; E21B43/267
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
93 words
A process for increasing the productivity of a subterranean formation penetrated by a wellbore comprising forcing a fracturing fluid into the formation under sufficient pressure to fracture the formation wherein the fracturing fluid has suspended therein a solid acidic material of the formula: ##SPC3## wherein n is 1 or 2 and R is NH 2 , --Cl, --OH, --NO 2 , alkyl, carboxyl or ether which will slowly dissolve upon contact with sufficient aqueous medium and attack the formation and, displacing the fracturing fluid and suspended solid acidic material into the fractured formation.
Claim 2
Dependent Claim
93 words
A process for increasing the productivity of a subterranean formation penetrated by a wellbore comprising forcing a fracturing fluid into the formation under sufficient pressure to fracture the formation wherein the fracturing fluid has suspended therein a solid acidic material of the formula: ##SPC3## wherein n is 1 or 2 and R is NH 2 , --Cl, --OH, --NO 2 , alkyl, carboxyl or ether which will slowly dissolve upon contact with sufficient aqueous medium and attack the formation and, displacing the fracturing fluid and suspended solid acidic material into the fractured formation.
Claim 3
Dependent Claim
13 words
A process as in claim 1 wherein the fracturing fluid is an oil.
Claim 4
Dependent Claim
12 words
A process as in claim 1 wherein the fracturing fluid is aqueous.
Claim 5
Dependent Claim
22 words
A process as in claim 1 wherein the acid said solid acidic material is of the formula: ##SPC4## wherein R is --NH.
Claim 6
Dependent Claim
24 words
A process as in claim 1 wherein the solid acidic material is taken from the group consisting of sulfanilic, metanilic, orthanilic, o-salicyclic and p-hydroxybenzoic.
Claim 7
Dependent Claim
66 words
A process for increasing the productivity of a subterranean formation penetrated by a wellbore comprising forcing a fracturing fluid into the formation under sufficient pressure to fracture the formation wherein the fracturing fluid has suspended therein sulfanilic acid which will slowly dissolve upon contact with sufficient aqueous medium and attack the formation and, displacing the fracturing fluid and the suspended sulfanilic acid into the fractured formation.
Claim 8
Dependent Claim
66 words
A process for increasing the productivity of a subterranean formation penetrated by a wellbore comprising forcing a fracturing fluid into the formation under sufficient pressure to fracture the formation wherein the fracturing fluid has suspended therein sulfanilic acid which will slowly dissolve upon contact with sufficient aqueous medium and attack the formation and, displacing the fracturing fluid and the suspended sulfanilic acid into the fractured formation.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-07-13 | 1980-01-12 | 1980-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-13 | 1984-01-12 | 1984-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-13 | 1988-01-12 | 1988-07-13 | $7700.00 | Window Closed / Lapsed |